Clock attachment for electric thermostats.



F. S. DENISON.

CLOCK ATTACHMENT.FOR ELECTRIC THERMOSTATS.

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APPLICATION flLED JAN. 18. I916- Patented June 5, 1917.

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F. s. DEN'ISON. CLOCK ATTACHMENT FOR ELECTRICTHERMOSTATS.

APPLICATION FILED JAN. 16, l9l6- Patented June 5, 1917.

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" UNITED STATES PATENT OFFICE.

FREDERICK S. DENISON, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO MINNEAPOLISHEAT REGULATOR 00., OF MINNEAPOLIS, MINNESOTA, A CORPORATION.

CLOCK ATTACHMENT FOB ELECTRIC THERMOSTATS.

Specification of Letters Patent.

Patented June 5, 191 '7.

Application filed January 18, 191. Serial No. 72,696.

To all whom it may concern;

Be it known that I, FREDERICK S. DENI- SON, citizen of the UnitedStates, resident of Minneapolis, county of Hennepin, State of Minnesota,have invented certain new and useful Improvements in Clock Attachmentsfor Electric Thermostats, of which the following is a specification.

My invention relates to that class of attachments shown and described inthe patent to Kersteter, No. 1,012,365, issued December 19, 1911, andthe object of the invention is to provide a mechanism by means of which,through the operation of the time piece, the thermostatic contact pointscan be automatically shifted, not only from night to day adjustment, butfrom day to night adjustment.

A further object is to provide a mechanism of comparativel simpleconstruction for automatically shifting the contact polnts, and onewhich is easily accessible for examina tion or adjustment.

A further object is to provide a shifting mechanism which can beadjusted by hand in either direction whenever desired.

The invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin the claims.

In thev accompanying drawings forming part of this specification,

Figure 1 is a front view of a thermostat embodying my invention, withthe clock removed,

Fig. 2 is a side view of the same,

Fig. 3 is a rear view, partially in section, on the line wm of Fig. 2.

Fig. 4 is a similar view, showing the position assumed by the parts ofthe mechanism when the thermostat is set for a higher temperature thannormal,

Fig. 5 is a longitudinal sectional view through the lower portion of thebase of the thermostat, showing the connection of the attachment withthe post of the indicator hand,

Fig. 6 is a sectional view on the line yy Of Flg. 1, 0

Fig. 7 is a detail sectional view, showing the means for holding theshifting mechanism against premature movement.

In the drawing, 2 represents the base of the thermostat, 3 athermostatic bar mounted to close the electric circuit through contactposts 4 and 5 which are mounted in a plate 6 that is pivoted at 7 to thebase of the thermostat. This plate has a curved rack 8 formed on thelower end thereof, meshing with the teeth of a pinion 9 on a post 10which carries a finger grip 11 and the indicator hand 12 thatis movableover a scale 13 on the face of the base of the thermostat. A

spring 14 is provided at the upper end of the plate 6 and mounted tobear thereon with a yielding pressure, and while permitting freedom oflateral movement of said plate exerts sufficient pressure thereon toprevent premature or accidental change of position. The contact postsproject through a slot 15 provided in the base of the thermostat and areadjustable with their supporting plate toward and from the thermostaticA plate 16 is secured to the lower end of the base 2 by suitable means,such as screws 17, and has a bearing for the inner end of the stud 10and a crank arm 18 is mounted on said stud and pivotally connected to alink 20 which extends downwardly through a slot 21 in the wall of thethermostat base.

wardly turned arm 22 formed thereon and a simllar arm 23 is punched outof the upper portion of said plate and projects outwardly,

parallel with the arm 22. Between these arms a timepiece 24.- ispivoted, and held against premature oscillation by means of a spring 25substantially as shown and described in Patent No. 1,020,289, issuedMarch 12, 1912, to Minneapolis Heat Regulator Company, assignee of JoelC. Kersteter.

This time-piece has a dial26 on the rear face thereof provided withindicator hands 27, movable back and forth over the face of the dial foradjusting the alarm attachment of the time-piece, and an arm 28 ismounted on a post 29 that is geared to the alarm attachment by amechanism, not shown, as it forms no part of my present invention, andsaid arm carries an anti-friction roller 30. This arm revolves with thepost 29 when the alarm attachment of the time-piece is released. Thelink 20 is provided at its lower end with a stud 31. T-shaped, is.pivoted at one end on a stud 33 mounted in the lower portion of theplate 16 and having its opposite end mounted on the stud 31. The outerface of the head of the 'The lower end of the plate 16 has an out- Aplate 32, preferablv plate 33 is provided with recesses or depressions34 adapted to receive ribs 35 provided in the ends of the arms 36 and36. arms are provided with angular extensions 37 mounted on the stud 31and having outwardly projecting cam shaped flanges 38 and 39, one'uponeach side of the arm 28 and the roller 30.

The depressions 34 are arranged in groups and spaced to represent derecs, and graduations are preferably place adjacent to these depressionscorresponding to those on the thermostatic plate and indicating theproper adjustment of the arms 36 and 36* to obtain the desired degree ofadjustment for the thermostat. These graduations are on opposite sidesof the supporting stud 33 of the plate 32 and the arms 36 and 36 aremoved back and forth toward and from the axis of the-plate 32 to adjustthe flanges 38 and 39 into or out of the path of the roller 30. If thearms are adjusted as shown in Fig. 1, the shifting mechanism will be inits neutral position, the thermostat being set for 7 0 degrees and thearms 28 revolvingwithout moving the flanges 38 and 39. When the arms 36and 36" are moved outwardly on their graduations, the flanges at theopposite ends thereof will be swung inwardly toward the roller 30 andthe contact of the roller with the flanges will shift the plate 32 andmove the link 20 lengthwise to rock the arm 18 and move the contactpoints to the desired adjustment. Hand adjustment may be effected at anytime by turning the post 10, the plate 32 oscillating on its pivotalsupport to allow the link 20 to follow the adjustment of the arm 18.

In various ways the details of construction herein shown and describedmay be modified and still be within the scope of my invention.

I claim as my invention:

1. The combination, with a thermostat having a manually operatedadjusting means, of a time piece having an alarm attachment and arevolving arm connected therewith, a plate pivotally supported adjacentto 'one end in the rear of said time piece, members having a commonpivot on said plate and cam surfaces upon opposite sides of saidrevolving arm to be actuated thereby when said arm is revolved, andmeans connecting said plate and members with said manually operatedmeans for shifting it automatically for both day and night adjustment.

2. The combination, with a thermostat having a thermostatic bar andcontact posts upon opposite sides thereof, and means for adjusting saidposts with respect to said bar, of a time piece havingan alarmattachment and a revolving member mounted on the back thereof andconnected therewith, arms having cam surfaces uponopposite sides ofThese said revolving member and concentrically mounted for movementindependently of one another or simultaneously, and means connectingsaid arms with the adjusting means of said contact posts.

3. The combination, with a thermostat, including a manually operatedshifting mechanism, of a time piece having an alarm attachment and arevolving member connected therewith, substantially L-shaped memoershaving their short arms concentrically pivoted and provided with camsurfaces upon opposite sides of said revolving member, the oscillationof said arms on their pivot moving said cam surfaces into the path ofsaid revolving member or out of the path of the same for varying theshifting periods of said thermostat adjusting mechanism, and means forconnecting said members with said mechanism.

4. The combination, with a thermostat having contact posts and ashifting mechanism therefor, of a time piece having an alarm attachmentand a revolving member connected therewith, arms concentrically pivotedand having cam surfaces upon opposite sides of said revolving member tobe engaged and actuated thereby, a link connecting the pivot of saidarms with said shifting mechanism, said pivot being movablesimultaneously with said arms to permit manual adjustment of saidshifting mechanism and said arms being movable independently of oneanother through the operation of said revolving member.

5. The combination, with a thermostat having contact posts and ashifting mechanism therefor, of a time piece having an alarm attachmentand a revolving member connected therewith, a T-shaped plate supportednear one end in the rear of said time.

piece and having graduations on opposite sides of said pivot, armsconcentrically pivoted on said plate near its opposite end forindependent movement on sald graduations, said arms having cam surfacesupon opposite sides of said revolving member, and means connecting saidplate with said shifting mechanism, said plate bein free to oscillate onits pivot for manual a justment of said shifting mechanism, said'camsurfaces bein out of the path of said revolving member w en said armsare moved inwardly to the limit of said graduations, adjacent to thepivot of said plate.

6. The combination, with a thermostat having contact posts and ashifting mechanism therefor, of a time piece having an alarm attachmentand a revolving member connected therewith, 'a plate pivotally supportedin the rear of said time piece and having recesses representinggraduation: upon opposite sides of said pivot, arms pivoted on saidplate at a point remote from the pivot of said plate and having meansfor entering said recesses for locking said arms against prematuremovement, said arms having cam surfaces formed thereon upon oppositesides of said revolving member, the movement of said arms and theadjustment of said cam surfaces determining the time of engagement ofsaid revolving member therewith and the periods for shifting the contactposts and means connecting 10 said plate with said shifting mechanism.

7 The combination,.with a thermostat having contact posts and a shiftingmech anism therefor, of a time piece having an alarm attachment and arevolving member mounted on the back thereof and connected therewith,arms concentrically pivoted and having outwardlyprojecting flangesprovided with cam surfaces upon opposite sides of said revolving member,said arms being movable independently of one another to adjust said camsurfaces toward or from said member, and means connecting said arms withsaid shifting mechanism.

8. The combination, with a thermostat having a manually operatedadjusting means, of a time piece having an alarm attachment and arevolving arm connected therewith, a plate pivotally supported at oneend, members having a common pivot on said plate and provided with longand short arms, the latter projecting upon oppo site sides of saidrevolving arm and having cam surfaces to be engaged thereby, said platehaving means for engaging and locking said long arms and a linkconnecting the pivot of said members with manually operated means.

In witness whereof, I have hereunto set my hand this 12th day of January1916.

FREDERICK S. DENISON.

